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Letters Patent No 77,959, dated May 19, 1868;

IMPROVED LUBRIGATING-OIL.

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TO ALL WHOM IT MAY CONCERN: Be it known that whereas I, ROltEltT A. CIIESEBROUGII, of the city, county, and State of New York, did,

on the twenty-second day of August,'1865, obtain Letters Patent of the United Stntesfor purifying petroleum orceal-oil by filtration through bone-black and whereas-one 'ofthe products resulting from the process is a lubricating-oil, of fine quality, obtained by filtering crude oil through bone-black, without previous distillation; now, therefdrmthebbjcct of'the present'appli'cat ion is to more fully describe and particularizethc said product, and to claim Letters Patent for the same as a new and useful article of manufacture xandl' do hereby declare that the following is a full, clear, and e'xaetdescription'thereof.

Thematerial I use to manufacture into a refined lubricating-oil, is the he avy.crude "oil or petroleum, pro-- duced principally inwcstern Virginia, possessing a gravity of about 26 to 33. Baums hydromet'er. This? oil, as it comesfrom the earth, has naturally good lubricating-properties, but it contains natural acids, gri t, and impurities, which destroy machinery, and, inadditibn, its dark color a'nd strongpdorrcndcr it highly objectionable for mechanical or manufacturing purposes.

Myprocess, patented as aforesaid, takes out thenatural acids, grit, and impurities, and odor, and makes it lighter in'color, and produces a product or oil-cf fine quality for lubricating-purposes suitable for all kinds of machinery, and applicable, also, to other uses, as, for instance, to oiling wool, or to saturating rope in ropemaking. N

The color of the product varies from a light straw, as it first comes fromithe filter, to adeep claret at the end of the operation. i

My present mode of producing the oil or productn hich I here claim as my invention, is by filtering heavy crude oil according to the process secured to me in my Letters Patent, No. 49,502,,granted to me the twentysecond day of August, 1865, preferring to- 'u'se in the process a heated filter, as described in Letters Patent, No. 49,230, and p-referring,.also, to use bone-black prepared according to my Letters Patent, No. 56,179, although I do not wish to confinemyself to this exact method.

The product of the filtration is 'a. new article of oil, which I call Filtrene, and which is of a superior quality as a lubricator, and for. other purposes,-and will stand a greater degree of cold than animal or fish-oils,-contains ne'gum, and worksclean and bright on machinery. The specific gravity of filtrcne varies, in ordinary crises,

from 26 Baum to 35 Baum, aceording'to the difi'erent purposes to which it'rnay be applied.

The present method of refining petroleum is by distillation, but if distillation he applied to the refining of heavy petroleum, i-ts lubricating-qualities are injured by reason of the high heat required to vaporize it; but

in the new article or product, produced as ai'oresaid, by filtration, the valuable lubricating-qualities of the crude petroleum are retained in an improved state. i 7

What I ela im as new, and desire to securcby Letters Patent, is-

.Ifhe product or article ealledby me Filtrcne, as a new article of manufacture, V

I ROBT A. CHESEBHOUGH.

Witnesses:

D. B. Gnnjbs,

J. YAN SANryooan. 

